Using this HKS Hi - Power Muffler is easy. First, make sure your vehicle is parked on a flat surface and the engine is off. Then, remove the old muffler and install the new one following the included instructions. When driving with the new muffler, avoid rough terrains at high speeds to prevent damage. For maintenance, check the muffler regularly for any signs of rust or loose parts. Clean it with a mild soap and water solution every few months to keep it looking great and performing well.